A highly divergent Encephalomyocarditis virus isolated from nonhuman primates in Singapore

10.1186/1743-422X-10-248Virology Journal10

Interprofessional collaboration between junior doctors and nurses in the general ward setting: A qualitative exploratory study

10.1111/jonm.12503Journal of Nursing Management261Nov-1

Silicon nanoclusters containing nitrogen and sensitization of erbium luminescence in SiOx:Er

Silicon-rich silica samples doped with erbium were grown by PECVD and characterized by photoluminescence, time-resolved photoluminescence and Fourier transform infrared spectroscopy. We observe that upon increased silicon content, the absorption spectrum reveals the formation of a SiN bond. This indicates the possible incorporation of nitrogen from the precursor NO gas into the Si nanoclusters. The highest erbium photoluminescence is obtained for the sample with the highest silicon content and its decay characteristics are nearly single exponential with a time constant of 5 ms. In addition to erbium emission, a visible luminescence peak at about 550 nm is observed. This shows multi-exponential decay kinetics with decay times of the order of 10 ns. We propose that this emission is due to small Si nanoclusters covered by a SiN shell. From the measurements, we study a mechanism to explain the erbium excitation in this material

The Design and Development of The EBIS LEBT Solenoid Power Supply

This power supply was designed and developed at Brookhaven National Laboratory (BNL) as part of a new ion preinjector system called EBIS (Electron Beam Ion Source). It consists of a charging power supply, a capacitor bank, a discharge and recovery circuit and control circuits. The output is fed through cables into a solenoid magnet. The magnet's inductance is 1.9mH. The maximum charging voltage is 1000V. The power supply output is a half sine wave of 13ms duration. The repetition rate is 5Hz. The power supply output can be set to any value between 250A and 1900A in one second in order to accommodate the varying species of ions specified by different machine users

Versatile device for in-situ discharge cleaning and multiple coatings of long, small diameter tubes

Electron clouds, which can limit machine performance, have been observed in many accelerators including RHIC at BNL. Additional concern for the RHIC machine, whose vacuum chamber is made from relatively high resistivity 316LN stainless steel, is high wall resistivity that can result in unacceptably high ohmic heating for superconducting magnets. The high resistivity can be addressed with a copper (Cu) coating; a reduction in the secondary electron yield can be achieved with a TiN or amorphous carbon (a-C) coating. Applying such coatings in an already constructed machine is rather challenging. We have been developing a robotic plasma deposition technique for in-situ coating of long, small diameter tubes. The technique entails fabricating a device comprising of staged magnetrons mounted on a mobile mole for deposition of about 5 ?m of Cu followed by about 0.1 ?m of a-C. As a first step, a 15-cm Cu cathode magnetron was designed, fabricated, and 30-cm long samples of the RHIC pipe have been coated with 2 ?m to 5.6 ?m of copper. Deposition rates of up to 92 A/sec with an average coating rate of 30 A/sec were measured. Effects on RF resistivity is also to be measured

Anode region design and focusing properties of STAR Silicon Drift Detectors

This article presents the design and reports on the performance properties of the anode region of Silicon Drift Detectors (SDD's) for the Silicon Vertex Tracker (SVT) of the RHIC STAR experiment [1]. The SVT will consist of 216 SDD's. Prototype detectors with bi--directional drift and total area 6.3\Theta6.